Well something must have changed because I've got CCR on a Woodstock DVD..'The Director's Cut'.... so somebody must have changed their mind.
I'm not sure that the quality of the CCR performance is really in question. virtually no performer will have produced a 'perfect' performance.
IMHO this decision to not participate in the original Woodstock LP and film was the biggest and most costly mistake Creedence Clearwater Revival ever made...and if that decision is down to JF then....
Almost without exception the performers on the film and LP have achieved a level of fame/immortality which I'm afraid has eluded CCR and which John Fogerty can only dream of.